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Engineering educational research section Civil and Environmental Engineering Program |
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IRIE Mitsuteru
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Research Areas 【 display / non-display 】
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Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Hydroengineering
Education 【 display / non-display 】
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Tokyo Institute of Technology Graduate School, Division of Integrated Science and Engineering
- 2000.3
Country：Japan
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Tokyo Institute of Technology Faculty of Engineering Civil Engineering
- 1995.3
Country：Japan
Papers 【 display / non-display 】
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SHIBAHARA Kotaro, IRIE Mitsuteru
Japanese Journal of JSCE 82 ( 16 ) n/a 2026
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
The Kitagawa River in northern Miyazaki Prefecture features six consecutive open levees with openings created on purpose. These structures allow floodwaters to overflow into adjacent paddy fields during floods, thereby reducing downstream flood risks in Nobeoka City. However, because the current openings are at nearly the same elevation as the high-water channel, driftwood and debris frequently flow into the paddy fields, causing crop damage and high cleanup costs. To address this, our study proposes raising the levee openings to lower the frequency of flooding in the paddy fields. Using numerical simulations, we evaluated both the flood control performance and the reduction in debris-related damage associated with the proposed modification. The results show that the raised openings improve flood mitigation compared to the current open levees and reduce the inflow of driftwood and debris. However, the raised openings also increase the water level difference between the inside and outside of the levees, raising the risk of piping. These results indicate that although raising the openings can successfully lower flooding frequency and debris damage, it also heightens the potential for piping and possible levee failure. A balanced approach is crucial when considering this strategy in future flood management planning.
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Irie M., Manabe Y., Yamashita M.
Drones 8 ( 6 ) 2024.6
Publishing type：Research paper (scientific journal) Publisher：Drones
The observation of the phytoplankton distribution with a high spatiotemporal resolution is necessary to track the nutrient sources that cause algal blooms and to understand their behavior in response to hydraulic phenomena. Photography from UAVs, which has an excellent temporal and spatial resolution, is an effective method to obtain water quality information comprehensively. In this study, we attempted to develop a method for estimating the chlorophyll concentration from aerial images using machine learning that considers brightness correction based on insolation and the spatial distribution of turbidity evaluated by satellite image analysis. The reflectance of harmful algae bloom (HAB) was different from that of phytoplankton seen under normal conditions; so, the images containing HAB were the causes of error in the estimation of the chlorophyll concentration. First, the images when the bloom occurred were extracted by the discrimination with machine learning. Then, the other images were used for the regression of the concentration. Finally, the coefficient of determination between the estimated chlorophyll concentration when no bloom occurred by the image analysis and the observed value reached 0.84. The proposed method enables the detailed depiction of the spatial distribution of the chlorophyll concentration, which contributes to the improvement in water quality management in reservoirs.
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Irie M., Arakaki S., Suto T., Umino T.
Remote Sensing 16 ( 1 ) 2024.1
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Remote Sensing
Riverbed materials serve multiple environmental functions as a habitat for aquatic invertebrates and fish. At the same time, the particle size of the bed material reflects the tractive force of the flow regime in a flood and provides useful information for flood control. The traditional riverbed particle size surveys, such as sieving, require time and labor to investigate riverbed materials. The authors of this study have proposed a method to classify aerial images taken by unmanned aerial vehicles (UAVs) using convolutional neural networks (CNNs). Our previous study showed that terrestrial riverbed materials could be classified with high accuracy. In this study, we attempted to classify riverbed materials of terrestrial and underwater samples including that which is distributed in shallow waters where the bottom can be seen using UAVs over the river segment. It was considered that the surface flow types taken overlapping the riverbed material on images disturb the accuracy of classification. By including photographs of various surface flow conditions in the training data, the classification focusing on the patterns of riverbed materials could be achieved. The total accuracy reached 90.3%. Moreover, the proposed method was applied to the river segments to determine the distribution of the particle size. In parallel, the microtopography was surveyed using a LiDAR UAV, and the relationship between the microtopography and particle size distribution was discussed. In the steep section, coarse particles were distributed and formed riffles. Fine particles were deposited on the upstream side of those riffles, where the slope had become gentler due to the dammed part. The good concordance between the microtopographical trends and the grain size distribution supports the validity of this method.
DOI： 10.3390/rs16010173
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Irie M., Nakagawa A., Higashi T.
Water (Switzerland) 15 ( 18 ) 2023.9
Authorship：Lead author, Corresponding author Publishing type：Research paper (scientific journal) Publisher：Water (Switzerland)
In the uppermost stream of the Mimikawa River, in northern Miyazaki Prefecture, the contribution to river turbidity of a huge, collapsed slope alternating sandstone and mudstone layers was qualitatively shown in our previous study. In this study, the water level and turbidity were continuously observed, to obtain a quantitative estimation of this contribution. The conversion equation from the water level to the flow rate is required, but field measurements during the flooding term in the mountainous site are difficult. In this study, a high-resolution survey was conducted, and the relationship was determined via a small-scale hydraulic model shaped using a 3D printer from the survey results, to determine the relationship between the water level and the flow rate. The flow rate time series was reproduced with the distributed runoff model that is verified with the flow rate converted from the water level. The flow rate and turbidity load time series were also estimated from the long-term rainfall. The area of the bare soil surface of each small basin was obtained via satellite image analysis, and the soil yield from each surface condition was calculated. Furthermore, the amount of turbidity produced upstream of Kamishiiba Dam was calculated for each small basin. It was estimated that 24% of the turbidity was generated from the small basin covering 5.7% of the total catchment area. This study showed that it is possible to verify the hydrological model by obtaining the water-level–discharge relationship, even in the mountains, where it is difficult to observe the discharge on-site, via small-scale hydraulic model experiments.
DOI： 10.3390/w15183186
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Ito K., Matsunaga M., Itakiyo T., Oishi H., Nukazawa K., Irie M., Suzuki Y.
International Journal of Sediment Research 38 ( 3 ) 469 - 480 2023
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：International Journal of Sediment Research
Sediment causes a serious problem in relation to dam function. A cooperative sediment sluicing operation has been under way since 2017 to prevent sediment from accumulating in dams in the Mimi River, Miyazaki, Japan. To achieve a smooth and stable operation, it is very important to determine the sediment source and a sediment transport system to maintain the dam's function. In the current study, the source and transport of sediment from the Mimi River basin have been analyzed with X-ray diffraction (XRD) to reveal the peaks of mineral species. The sediment samples were collected in the Mimi River basin from the Tsukabaru Dam to the sea in an area including 4 dams and 5 tributaries. In addition, the minerals in samples collected in 2014, before the start of the sediment sluicing operation, and from 2018 to 2020, after the start of the operation, were analyzed. An evaluation of the similarity of the sediment at each sampling point based on the X-ray diffraction peaks of mineral species showed that sediment distributed upstream was transported downstream in the year when the sediment sluicing was done. This result indicates that the sediment sluicing operation at dams ensured the continuity of the sediment distribution in the Mimi River basin. In addition, an investigation done in 2020 showed that sediment particles very similar to those of the upstream tributaries were deposited downstream because of extensive flooding caused by a large typhoon. The management of sediment transport has the greatest importance in a river basin where a dam is to be constructed. It is possible to trace the history of the sediment distribution and movement resulting from the operation of sediment sluicing by using sediment mineral analysis.
Books 【 display / non-display 】
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沙漠学事典
日本沙漠学会編（ Role： Contributor）
丸善株式会社 2020.7
Language：Japanese Book type：Dictionary, encyclopedia
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ISSUE OF SURFACE WATER RESOURCES AND ALTERNATIVE SOLUTIONS
Irie M., Tarhouni J.（ Role： Sole author）
Encyclopedia of Africa: Volume 11: (11 Volume Set) 2020.1 （ ISBN:9781536172348 ）
Book type：Scholarly book
Surface water resources in Tunisia, which cover half of the water supply of this country, have problems such as environmental impact, flooding and reduction of sustainability due to sedimentation. These issues must be controlled with careful management with the understanding of the phenomena in the field in detail. What happened in the fields is changed depending on the condition of each environment. In addition to the technical discussion, implementation and spread of the technology to society should be carried out with the quantitative evaluation of its benefits to enlighten the society. This chapter introduces the situation of the surface water resources in Tunisia, what is the problem, the reasons for it and alternatives of practical solutions, including the point of view of economical feasibility, etc.
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RESEARCH AND EDUCATION ACTIVITIES IN ARENA
Kawachi A., Morio T., Irie M., Iwasaki M., Kashiwagi K., Isoda H.（ Role： Sole author）
Encyclopedia of Africa: Volume 11: (11 Volume Set) 2020.1 （ ISBN:9781536172348 ）
Book type：Scholarly book
After its foundation, ARENA has rapidly extended its research and education activities in interdisciplinary approach involving life sciences, energy and environment, humanities and social sciences, and ICT and innovation. In this chapter, we describe the outline of development and expansion of research and educational activities of ARENA, focusing on 2007 to 2013. The research projects, starting from exploration of bioresources, have developed to comprehensive and interdisciplinary research based on exploration of bio-, water- and energy resources considering local cultural context of Islamic world and contribution to regional development through establishment of a framework of innovation. For education, mutual student exchange is extending beyond North Africa involving Europe and Middle East.
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Resource-Oriented Agro-sanitation Systems
1) Sintawardani N., Ushijima K., Hamidah U., Deguchi Y. Triastuti J., Funamizu N., Irie M., Ishikawa T.（ Role： Joint author）
Springer 2019
Language：Japanese Book type：Scholarly book
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Sustainable North African Society -Exploring Seeds and Resources for Innovation-
Isoda H., Neves M. Kawachi A.（ Role： Joint author）
Nova Publisher 2015.1
Language：English Book type：Scholarly book
MISC 【 display / non-display 】
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セラミックスが実現 する途上国の水環境 問題：水処理技術か ら水資源管理まで
袋布昌幹・入江光輝
セラミックス 53 ( 2 ) 66 - 69 2018.2
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal)
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筑波大学北アフリカ研究センターでの学際的研究の取り組み
入江光輝，柏木健一，礒田博子
沙漠研究 23 ( 3 ) 147 - 150 2013.12
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本沙漠学会
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バイオ燃料事業の実施上の課題‐事業採算性と二酸化炭素排出削減に関するレビュー‐
入江光輝
沙漠研究 21 ( 3 ) 99 - 102 2011.12
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本沙漠学会
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チュニジアの水資源とその循環利用
安部征雄，礒田博子
沙漠研究 18 ( 3 ) 171 - 175 2009.12
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本沙漠学会
Presentations 【 display / non-display 】
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大淀川鶴島地区砂州の洪水時流況とその生物多様性について
片上大宙, 入江光輝
令和7年度土木学会西部支部研究発表会 2026.3.7
Event date： 2026.3.7
Language：Japanese Presentation type：Oral presentation (general)
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貯水池底泥を使用した土のうによる森林作業道整備の基礎的検討
堂薗紘嵩, 入江光輝
令和7年度土木学会西部支部研究発表会
Event date： 2026.3.7
Language：Japanese Presentation type：Oral presentation (general)
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UAV空撮画像の自動判別による河床環境および流況の評価手法の開発
宮武直希, 入江光輝
令和7年度土木学会西部支部研究発表会 2026.3.7
Event date： 2026.3.7
Language：Japanese Presentation type：Oral presentation (general)
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耳川湾曲部における土砂堆積特性
岩切円花, 入江光輝
令和7年度土木学会西部支部研究発表会 2026.3.7
Event date： 2026.3.7
Language：Japanese Presentation type：Oral presentation (general)
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北川霞堤家田地区の水制を用いた堤内地への塵芥流入抑制の検討
柴原孔太郎, 入江光輝
令和7年度土木学会西部支部研究発表会 2026.3.7
Event date： 2026.3.7
Language：Japanese Presentation type：Oral presentation (general)
Awards 【 display / non-display 】
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ダム工学会 論文賞
2016.4 ダム工学会
石川忠晴、王明陽、入江光輝、中村恭志
Award type：International academic award (Japan or overseas) Country：Japan
Grant-in-Aid for Scientific Research 【 display / non-display 】
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健全な流砂系の回復によるサステナブル流域総合土砂管理の実証研究
Grant number：17H03314 2017.04 - 2020.03
科学研究費補助金 基盤研究(B)
Authorship：Coinvestigator(s)
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食料増産に向けた大河川の農地氾濫制御事業評価のための新たな便益評価基準の検討
Grant number：16KT0026 2016.08 - 2019.03
科学研究費補助金 基盤研究(B)
Authorship：Principal investigator
大陸大河川の治水事業が速やかに実施できるよう、費用便益評価の基準について再考を行う。ケーススタディサイトとしてセネガル川下流部のモーリタニア国側氾濫域を対象とする。
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世界遺産イシュケウルの物質サイクルを活用した持続可能な環境復元・管理技術の提案
Grant number：15H02634 2015.04 - 2019.03
科学研究費補助金 基盤研究(A)
Authorship：Coinvestigator(s)
侵食傾向にある湿地の底泥を安定化し、塩水侵入を制御する
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サハラ砂漠周縁の水資源に関わる2大問題解決に向けた調査研究
Grant number：25257306 2013.10 - 2017.03
科学研究費補助金 基盤研究(A)
Authorship：Principal investigator
乾燥地貯水池の堆砂管理と飲料用地下水の浄化に同時に取り組む
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サハラ砂漠周縁貯水池の持続的利用のための新たな管理・運営手法構築に向けた調査研究
Grant number：22404009 2010.04 - 2013.03
科学研究費補助金 基盤研究(B)
堆砂の著しい貯水池の底泥中に含まれる腐植物質の有効利用等について検討